Seat comprising a plurality of individually adjustable back members



0a. 23, 1962 o. A. BECKER 3,

SEAT COMPRISING A PLURALITY OF INDIVIDUALLY ADJUSTABLE BACK MEMBERS 2 Sheets-Sheet 1 Filed May 19, 1961 Oct. 23, 1962 o. A. BECKER 3,059,971

SEAT COMPRISING A PLURALITY OF INDIVIDUALLY ADJUSTABLE BACK MEMBERS Filed May 19, 1961 2 Sheets-Sheet 2 United States Patent 3,059,971 SEAT COMPRISING A PLURALITY 0F INDI- VIDUALLY ADJUSTABLE BACK MEMBERS Otto Alfred Becker, 59 Robert-Koch-Str. Saarbrucken, Germany Filed May 19, 1961, Ser. No. 111,322 2 Claims. (Cl. 297353) This invention relates to chairs and similar seating devices and more particularly to devices of that type which include a seat frame and an adjustable back rest frame.

In known seating devices of said type a back rest frame is adjustably mounted in the seat frame for forward and rearward displacement relative thereto and supports two separate back rests or pads, namely one for the small of the back of the chair occupant and a second for the upper or shoulder portion of his back, each back rest or pad being adjustable in vertical direction.

The said known seating devices did not, however, permit a completely satisfactory adaptation of the back rests to many particular body shapes of the chair occupant. To avoid the said and other disadvantages I use according to my invention two separate and mutually independent back rest frames each of which is adjustably mounted in the seat frame being individually forwardly and rearwardly displaceable relative thereto, and each of which supports a vertically adjustable back rest or pad namely one for the small of the back and one for the shoulder portion of the chair occupant.

The said and other objects of my invention will be more fully understood from the following specification when read with the accompanying drawing in which one embodiment is illustrated. In the drawing FIG. 1 is a rear view of a vertically adjustable swivel chair.

FIG. 2 is a side elevation of this chair, and

FIG. 3 shows a detail of FIG. 2 in a side elevation on an enlarged scale.

As shown in the drawing the vertically adjustable swivel chair comprises a chair frame 1 with base ring 2, a seat 3 resting upon a seat frame 15, 16, 17 mounted on said chair frame, and padlike back supporting members 4a, 4b. The lower member 4a serves to support the small of the human back and the upper member 4b serves to support the human body above the small of the back. Each of the members 4a, 4b is individually vertically slidably mounted on a resilient back rest frame formed by round-section steel rods 5a and 5b, respectively, and secured thereto with set screws 6a and 6b, respectively, which cooperate with bridge members 70 and 7b, respectively, to force the round-section rods 5:: and 5b against the members 4a, 4b, respectively.

These round-section rods 5a and 5b which carry the padlike members 4a, 4b extend below the seat 3 through angle members 8a, 8b formed with appropriate holes so 5 that the rods can be individually displaced forwardly or rearwardly (see FIG. 3). This enables an exact adaptation of the also vertically adjustable back supports 4a,

"ice

4b to the individual form of the seated human body. Additionally the said back supports may be mounted on said bridge members 7a, 7b, pivotably on horizontal spindles 9a, 9b and supported by springs 10a, 1012.

While one specific embodiment of my invention has been shown and described in detail to illustrate the application of the principles of my invention, it will be well understood that the same may be otherwise embodied without departing from such principles.

What I claim as my invention is:

1. In an adjustable chair the improvement comprising in combination (a) a substantially horizontal seat frame,

(b) a substantially vertical back-supporting chair portion composed of two mutually independent back rest frames;

(0) each of said back rest frames adjustably mounted upon said seat frame for individual displacement forwardly and rearwardly relative thereto,

(d) a first back rest or pad mounted on one of said back rest frames for adjustment in vertical direction relative to the small of the back of the chair occupant and a second back rest or pad mounted on the other back rest frame for adjustment in vertical direction relative to the shoulders of such chair occupant,

(e) and retaining means for securing the said back rest frames and the said back rests or pads in any individually adjusted position.

2. In an adjustable chair the improvement comprising in combination (a) a substantially horizontal seat frame,

(b) a substantially vertical back-supporting chair portion composed of two mutually independent L-shaped back rest frames having a horizontal and an upstanding arm,

(c) said horizontal arms slidably and adjustably mounted in said seat frame for individual displacement forwardly and rearwardly relative thereto,

(d) a first back rest or pad mounted on one of said upstanding arms for adjustment in vertical direction relative to the small of the back of the chair occupant, and asecond back rest or pad mounted on the other of said upstanding arms for adjustment in vertical direction relative to the shoulders of such chair occupant, and

(e) retaining means for securing the said back rest frames and the said back rests or pads in any individually adjusted position.

References Cited in the file of this patent UNITED STATES PATENTS 693,685 Case Feb. 18, 1902 2,063,732 Gailey Dec. 8, 1936 2,400,630 Cramer May 21, 1946 FOREIGN PATENTS 332,759 Great Britain July 31, 1930 

